Mirabegron: A new option in treating overactive bladder.

Antimuscarinic medications have long been the mainstay of drug treatment for overactive bladder. This article describes mirabegron, one of a new class of agents that relaxes the detrusor muscle directly via a beta3 adrenoceptor agonist. Mirabegron's efficacy on frequency, urgency, and urge incontinence was tested in several trials before its wide clinical introduction. However, caution is still needed as data are lacking on the drug's efficacy and safety in frail older adults and for long-term therapy.